Showing Recent Issues Undefined symbol: _UnityGetPhysicalMemory

In Xcode Run Log:

Undefined symbols for architecture arm64:
“_UnityGetPhysicalMemory”, referenced from:
systeminfo::GetPhysicalMemoryMB() in libiPhone-lib.a(TrampolineGlue.o)
“_UnityDeviceSupportsUpsideDown”, referenced from:
-[SplashScreenController create:] in SplashScreen.o
ScreenManagerIPhone::RequestOrientation(ScreenOrientation) in libiPhone-lib.a(PlatformDependent_iPhonePlayer_0.o)
ld: symbol(s) not found for architecture arm64

clang: error: linker command failed with exit code 1 (use -v to see invocation)

-------------------> Unity2018.4.17f1,Undefined symbols for architecture arm64:
“_UnityGetPhysicalMemory”, referenced from:
systeminfo::GetPhysicalMemoryMB() in libiPhone-lib.a(TrampolineGlue.o)
“_UnityDeviceSupportsUpsideDown”, referenced from:
-[SplashScreenController create:] in SplashScreen.o
ScreenManagerIPhone::RequestOrientation(ScreenOrientation) in libiPhone-lib.a(PlatformDependent_iPhonePlayer_0.o)
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Im having the same issue, stuck with now solution. Can anybody help?